Why is there a contradiction between SRT and GRT in strong gravitational fields? What is the cause of the relativistic effects? Worin besteht der Widerspruch im What is the contradiction in the expression ћω = mc² when considering the cosmological redshift? What is the cause of Planck's uncertainty principle? Can you really simulate the Big Bang with a particle accelerator? Are the universal natural constants really constant? What is the meaning of the so-called Planck units? Are there references to the universal natural constants? Can the unexpected result of the Supernova Ia cosmology experiment also be explained without dark matter and increasing expansion? Why does the radiation curve of a black body have exactly this shape and no other? Is it possible to calculate the Hubble parameter and the CMBR temperature?All these questions and more are answered by the present model without dark matter, without inflation, with variable natural constants and expansion. Since some of the variable natural constants also affect the observer, i.e. he is affected by them himself, some of the changes cancel out. A virtual relativity principle applies. The laws of nature just seem to be the same in all frames of reference. Changes in v3: A lot of graphics redrawn with higher resolution, re-layout, editorial revisions, added new section, expanded contents.German version available. Title of the German version: "Das metrische Universum".